I am trying to program a dubstep type bass in reason on the subtractor.
I want the LFO low-pass filter to start on the low end on keypress (to get the "woowoowoo"
sound. It seems to start wherever, is there anyway to make it start on one end of the
filter on every kepress?

I understand how to create a wobble, but I want to make sure on every
key press it starts on the low, so it sounds like "wowowow" instead of starting with
"owowow", if that makes any sense (try sounding it out). On the microkorg there is an LFO
key sync, but it starts on the high end of the filter (i.e. owowow), but Ive made a
perfect sounding patch on the subtractor in reason except for the "key sync", i.e. it
starts on the "ow" sound. I hope what I'm asking makes sense although i do understand
when describing these sounds it may not be perfect.

... and another reply from someone who also doesn't know Reason well :-)

If you
record the sound, then import into a sampler, you should be able to adjust the start
position used when the sample is played back, thus chopping off the first bit of the LFO
shape and effectively changing its phase. Or if the Reason samplers don't support
adjusting the start position, then you could do the fiddling in a wave editor.

Did you find a solution? Know its a bit late but I've just read this post - would it be
something as simple as adjusting the filter envelopes? Push the attack slider up a bit to
slow the attack to get your 'wow' on the start of the note. Hope this helps.

Quote TrayElectric:Did you find
a solution? Know its a bit late but I've just read this post - would it be something as
simple as adjusting the filter envelopes? Push the attack slider up a bit to slow the
attack to get your 'wow' on the start of the note. Hope this helps.

Since this post was made, i've had a few
goes at doing it myself on various synths. Both hardware, and software, including Reason.
It's not difficult The James Bernard tutorials are well worth watching, because what he
shows you in there doesn't just go for Reason, or even just Thor in Reason. You can apply
it to most synths.

It basically boils down to a tempo synced LFO, that is
assigned to filter cut off. You can also assign that same LFO to other sound changing
parameters, like resonance or wavetable movement. So rather than manually adjusting
the filter cutoff, which you'd rarely get quite in time. The tempo synced LFO takes care
of that for you. You just adjust the LFO rate knob instead, which works in various musical
timings. There is another trick Reason users can use though.. James Bernard made an
'automation toolbox' Think of it as pre recorded LFO's that you can dump on an automation
track for anything you want (usually filter cutoff)The good thing about these files,
is that if the LFO doesn't start exactly where you want it to, then you just shift the
automation file back or forwards by the required amount. Easy!

I don't think this will work in Subtractor since the LFO rate has to be displayed in
Hertz. I think you can use Thor for this.

What he does is he calculates synced
rates in Hertz using a formula that utilises the BPM of the track. You may not get spot on
values but it enables you to slide between synced rates smoothly rather than instantly.
It's not something I would use for every sound, but it sounds pretty cool sometimes.